CppCheck complains if a variable definition can be moved into
one block without changing the outcome. The rationale is that
defining the variable outside the block often hints to the
variable's value persisting throughout a while or for loop.
Also if defined outside a block it occupies stack space
longer than necessary. => Reduced the scope of all variables,
wherever possible which causes the following cppcheck warnings
to disappear:

nanosvgrast.h:1024:21: warning: The scope of the variable 'gy' can be reduced. [variableScope]
  float fx, fy, dx, gy;
                    ^
nanosvgrast.h:1026:10: warning: The scope of the variable 'cr' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
         ^
nanosvgrast.h:1026:14: warning: The scope of the variable 'cg' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
             ^
nanosvgrast.h:1026:18: warning: The scope of the variable 'cb' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
                 ^
nanosvgrast.h:1026:22: warning: The scope of the variable 'ca' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
                     ^
nanosvgrast.h:1027:16: warning: The scope of the variable 'c' can be reduced. [variableScope]
  unsigned int c;
               ^
nanosvgrast.h:1069:21: warning: The scope of the variable 'gx' can be reduced. [variableScope]
  float fx, fy, dx, gx, gy, gd;
                    ^
nanosvgrast.h:1069:25: warning: The scope of the variable 'gy' can be reduced. [variableScope]
  float fx, fy, dx, gx, gy, gd;
                        ^
nanosvgrast.h:1069:29: warning: The scope of the variable 'gd' can be reduced. [variableScope]
  float fx, fy, dx, gx, gy, gd;
                            ^
nanosvgrast.h:1071:10: warning: The scope of the variable 'cr' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
         ^
nanosvgrast.h:1071:14: warning: The scope of the variable 'cg' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
             ^
nanosvgrast.h:1071:18: warning: The scope of the variable 'cb' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
                 ^
nanosvgrast.h:1071:22: warning: The scope of the variable 'ca' can be reduced. [variableScope]
  int i, cr, cg, cb, ca;
                     ^
nanosvgrast.h:1072:16: warning: The scope of the variable 'c' can be reduced. [variableScope]
  unsigned int c;
               ^
nanosvgrast.h:1225:8: warning: The scope of the variable 'r' can be reduced. [variableScope]
   int r = 0, g = 0, b = 0, a = row[3], n = 0;
       ^
nanosvgrast.h:1225:15: warning: The scope of the variable 'g' can be reduced. [variableScope]
   int r = 0, g = 0, b = 0, a = row[3], n = 0;
              ^
nanosvgrast.h:1225:22: warning: The scope of the variable 'b' can be reduced. [variableScope]
   int r = 0, g = 0, b = 0, a = row[3], n = 0;
                     ^
nanosvgrast.h:1225:41: warning: The scope of the variable 'n' can be reduced. [variableScope]
   int r = 0, g = 0, b = 0, a = row[3], n = 0;
                                        ^
nanosvgrast.h:1265:9: warning: The scope of the variable 'j' can be reduced. [variableScope]
 int i, j;
        ^
nanosvgrast.h:1289:15: warning: The scope of the variable 'count' can be reduced. [variableScope]
  int ia, ib, count;
              ^